61645056 has 72 divisors (see below), whose sum is σ = 179005344. Its totient is φ = 18677760.

The previous prime is 61645033. The next prime is 61645061. The reversal of 61645056 is 65054616.

It is a super-2 number, since 2×61645056² = 7600225858486272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4800 + ... + 12096.

Almost surely, 2^61645056 is an apocalyptic number.

61645056 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61645056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89502672).

61645056 is an abundant number, since it is smaller than the sum of its proper divisors (117360288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61645056 is a wasteful number, since it uses less digits than its factorization.

61645056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7327 (or 7313 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 61645056 is about 7851.4365564526. The cubic root of 61645056 is about 395.0324301740.

The spelling of 61645056 in words is "sixty-one million, six hundred forty-five thousand, fifty-six".